He was one of the principal authors of the Northwest Ordinance of 1787, as revolutionary a document as his Declaration of Independence. The Ordinance provided for the admission into the Union of from three to five states from the territory east of the Mississippi and north of the Ohio, when the territories had a large enough population. These states would be fully equal to the original thirteen. Thanks to Thomas Jefferson, the United States would be an empire without colonies, an empire of equals.

